| (19) |
 |
|
(11) |
EP 1 078 936 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
18.07.2001 Bulletin 2001/29 |
| (43) |
Date of publication A2: |
|
28.02.2001 Bulletin 2001/09 |
| (22) |
Date of filing: 14.08.2000 |
|
| (51) |
International Patent Classification (IPC)7: C08F 6/00 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
27.08.1999 US 151096 P
|
| (71) |
Applicant: ROHM AND HAAS COMPANY |
|
Philadelphia, Pennsylvania 19106-2399 (US) |
|
| (72) |
Inventors: |
|
- Chang-Mateu, I-Hway Midey
Ambler, Pennsylvania 19002 (US)
- McFadden, Dawn Marie
Yardley, Pennsylvania 19067 (US)
- Lipovsky, James Michael
Langhorne, Pennsylvania 19047 (US)
- Wu, Richard Shu-Hua
Ft. Washington, Pennsylvania 19034 (US)
|
| (74) |
Representative: Buckley, Guy Julian |
|
ROHM AND HAAS (UK) LTD. European Operations Patent Department Lennig House 2 Mason's
Avenue
Croydon CR9 3NB
Croydon CR9 3NB (GB) |
|
| |
|
| (54) |
Process for stripping polymer dispersions or solutions |
(57) This invention relates to a process for stripping polymer reaction compositions.
The process reduces gel in the polymer reaction composition by adjusting the pH of
the polymer to from 7 to 11 prior to stripping and maintaining the adjusted pH during
stripping, maintaining the temperature of the polymer at from 30°C to 70°C during
stripping, utilizing a continuous stripping operation, or combinations thereof.